isVisible

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['my-component', 'display-flex'],
  classNameBindings: ['showComponent::hidden'],
  isVisible: true,
  showComponent: true,
  actions: {
   	onClick() {
      console.log('Hi');
      this.set('showComponent', false);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.display-flex {
 	display: flex !important; 
}

.hidden {
  display: none !important;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

This is a component that will be hidden
<MyComponent @text="Luis"/>

templates.components.my-component.hbs

{{text}}

<button onclick={{action "onClick"}}>Click me</button>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}